Big John, Little John

While on a trip to Florida, John Martin stumbles upon the legendary fountain of youth. Willing to test the waters, John sips a handful of the liquid. The consequences are unforeseeable, for he begins to revert to his childhood on certain times that are neither predictable nor controllable, causing many problematic situations for John and his family.

Big John is cast as Captain Hook in his school's production of Peter Pan , while Little John ends up having to play Peter Pan at the same time.

John tries a new formula in the laboratory that he hopes will cure him from his conversions.

John Martin is detained when a sheriff demands his ID and he cannot produce it. He gets his freedom when his personality changes in prison.

John has summoned Mr. Boswell, Stanley's dad, to account for his son's continuous absence to class for five days. Boswell explains that the boy is afraid of crossing in front of the Crabtree mansion, an abandoned house that neighbors believe it to be haunted. John decides to find out who's behind the Crabtree ghost.

It is vaccination day at the school and John turns into a kid and he gets vaccinated. Then at the end of the episode, he becomes a man and the other teachers take him to get vaccinated again, much to his chagrin.

John believes he has discovered the secret of the Fountain of Youth, so he calls a press conference to announce his discovery — but his "discovery" shows no signs of panning out as he had believed.

Big John's voice in Little John's body puts not only Martin in a squeeze but his family as well.

Stanley is again late for the class. The teacher is speaking to his students about the importance of facing up bullies. This leads to trouble for Little John when he's threatened by the class bully, Gasey.

John is assigned to find who is behind the vandalism inflicted on the school walls. Martin is invited to join the school basketball team since he was once a superhero for his old team.

Little John receives a severe reprimand for having played unwillingly a joke on the school principal.

Because of the arrangements for the annual Thanksgiving dance that is held at the school, Ms. Bottomly proposes to Professor Martin that he be one of the chaperons. At the same time, Little John is chosen by his female classmate as companion for that day.

In order to arrange a show for the school annual party, one of Martin's students prepares a set of different magic tricks.